Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[platform/kernel/linux-rpi.git] / arch / sh / kernel / machvec.c
1 /*
2  * arch/sh/kernel/machvec.c
3  *
4  * The SuperH machine vector setup handlers, yanked from setup.c
5  *
6  *  Copyright (C) 1999  Niibe Yutaka
7  *  Copyright (C) 2002 - 2007 Paul Mundt
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file "COPYING" in the main directory of this archive
11  * for more details.
12  */
13 #include <linux/init.h>
14 #include <linux/string.h>
15 #include <asm/machvec.h>
16 #include <asm/sections.h>
17 #include <asm/addrspace.h>
18 #include <asm/setup.h>
19 #include <asm/io.h>
20 #include <asm/irq.h>
21
22 #define MV_NAME_SIZE 32
23
24 #define for_each_mv(mv) \
25         for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
26              (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
27              (mv)++)
28
29 static struct sh_machine_vector * __init get_mv_byname(const char *name)
30 {
31         struct sh_machine_vector *mv;
32
33         for_each_mv(mv)
34                 if (strcasecmp(name, mv->mv_name) == 0)
35                         return mv;
36
37         return NULL;
38 }
39
40 static unsigned int __initdata machvec_selected;
41
42 static int __init early_parse_mv(char *from)
43 {
44         char mv_name[MV_NAME_SIZE] = "";
45         char *mv_end;
46         char *mv_comma;
47         int mv_len;
48         struct sh_machine_vector *mvp;
49
50         mv_end = strchr(from, ' ');
51         if (mv_end == NULL)
52                 mv_end = from + strlen(from);
53
54         mv_comma = strchr(from, ',');
55         mv_len = mv_end - from;
56         if (mv_len > (MV_NAME_SIZE-1))
57                 mv_len = MV_NAME_SIZE-1;
58         memcpy(mv_name, from, mv_len);
59         mv_name[mv_len] = '\0';
60         from = mv_end;
61
62         machvec_selected = 1;
63
64         /* Boot with the generic vector */
65         if (strcmp(mv_name, "generic") == 0)
66                 return 0;
67
68         mvp = get_mv_byname(mv_name);
69         if (unlikely(!mvp)) {
70                 printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
71                 for_each_mv(mvp)
72                         printk("'%s', ", mvp->mv_name);
73                 printk("\n\n");
74                 panic("Failed to select machvec '%s' -- halting.\n",
75                       mv_name);
76         } else
77                 sh_mv = *mvp;
78
79         return 0;
80 }
81 early_param("sh_mv", early_parse_mv);
82
83 void __init sh_mv_setup(void)
84 {
85         /*
86          * Only overload the machvec if one hasn't been selected on
87          * the command line with sh_mv=
88          */
89         if (!machvec_selected) {
90                 unsigned long machvec_size;
91
92                 machvec_size = ((unsigned long)&__machvec_end -
93                                 (unsigned long)&__machvec_start);
94
95                 /*
96                  * Sanity check for machvec section alignment. Ensure
97                  * __initmv hasn't been misused.
98                  */
99                 if (machvec_size % sizeof(struct sh_machine_vector))
100                         panic("machvec misaligned, invalid __initmv use?");
101
102                 /*
103                  * If the machvec hasn't been preselected, use the first
104                  * vector (usually the only one) from .machvec.init.
105                  */
106                 if (machvec_size >= sizeof(struct sh_machine_vector))
107                         sh_mv = *(struct sh_machine_vector *)&__machvec_start;
108         }
109
110         printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
111
112         /*
113          * Manually walk the vec, fill in anything that the board hasn't yet
114          * by hand, wrapping to the generic implementation.
115          */
116 #define mv_set(elem) do { \
117         if (!sh_mv.mv_##elem) \
118                 sh_mv.mv_##elem = generic_##elem; \
119 } while (0)
120
121         mv_set(irq_demux);
122         mv_set(mode_pins);
123         mv_set(mem_init);
124 }